摘要
针对电力系统中经常出现的噪声信号,本文提出了短时傅里叶变换和S变换的基本原理,对含有噪声的电压谐波信号进行了傅里叶变换和S变换的MATLAB仿真。用5%的布莱克曼窗对原始信号截取,三次多项式对原始信号进行了拟合,并用三次方根值对S变换的模矩阵进行改进计算,得到了谐波信号的参数指标。仿真结果证明,改进后的S变换克服了短时傅里叶变换的缺点,减少了频谱泄漏,为谐波检测中提供了一种有效的检测方法。
For noise signal that often occurs in the power system, this paper proposes an algorithm based on S transform matrix, introduces the basic principle of short-time Fourier transform and S transform., and MATLAB simulation. This research uses %5 blackman window, cubic polynomial to fit the original signal and three root value of S transform matrix to improve the calculated accuracy and gets the parameters of the noise signal.The simulation results show that the improved S transform overcomes the disadvantage of short time Fourier, more effectively reduces the spectrum leakage. It provides an effective detection method in the noise detection.
出处
《自动化技术与应用》
2015年第12期85-89,共5页
Techniques of Automation and Applications
基金
PCI数据采集的电能质量监测和评估系统研究(2013JK1015)
